Re: 700R4 Source for '56 GMC?
I don't believe they ever made a B-O-P pattern 700 r4 case. If you have to have that trans rather than a 200R4 buy the thick adapter plate with the spacers for the converter snout and converer bolts. I've used both and the thin plates with the nuts welded to them leave a lot to be desired.
They run the 200R4 behind some real stout engines though.
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Founding member of the too many projects, too little time and money club.
My ongoing truck projects:
48 Chev 3100 that will run a 292 Six.
71 GMC 2500 that is getting a Cad 500 transplant.
77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.
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